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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Contingencies      
Uncertain tax positions $ 1,126 $ 1,678 $ 1,901
Loss Contingency, Estimate of Possible Loss 1,000    
Inventories      
Schedule of Contingencies      
Long-term purchase commitment, amount $ 2,970